夹持千斤顶是重型起重作业的一个分支,常常被人们认为是特殊起重作业而被忽视。现代重型起重作业中,绳缆千斤顶和液压伸缩门座起重机的组合,往往是世界上大多数地方替代大型起重机的作业方式。 Clamping jacks are a branch of heavy lifting operations and are often overlooked as what people consider as special lifting operations. In modern heavy lifting operations, the combination of a rope jack and a hydraulic retractable portal crane is often the way that most large parts of the world replace large cranes.